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What is the difference between HVAC diffuser's neck velocity and face velocity?
Wiki User
∙ 10y ago
In HVAC terminology, a diffuser's neck velocity is defined as the velocity of air traveling through the duct work to the air outlet or inlet. The difference of the face velocity is this is a measurement of fume hood performance.
Wiki User
∙ 10y ago
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What is the difference between a passive sensor and an active sensor in a DDC?
Passive sensors; send information back to the controller in terms of resistance/ohms. The active sensor will send information back to the controller in terms of Milliamps, mA or Volts . HVAC/R
Which instrument is used to measure the maximum and minimum temperature of the day?
Kimo Hvac
How do you calculate the subcooling in HVAC?
To calculate subcooling in HVAC, you need to measure the liquid line temperature and pressure. First, convert the pressure into temperature using a temperature-pressure chart. Subtract the liquid line temperature from the converted temperature to calculate the subcooling. Subcooling is important to ensure the liquid refrigerant leaving the condenser is cooler than its saturation point to prevent the formation of flash gas in the metering device.
How do measure cfm in room?
I use an instrument called a "moving van anenometer" to measure velocity of the airflow in feet per minute. I take multiple readings at each register, average them, and multiply them by a percentage factor based on the "free area" of the register to obtain a volume reading in cubic feet per minute. Then I add up the CFM (cubic feet per minute) of each supply register in the room to determine the total air supply to that room.The HVAC Veteran
What materials can be used for office sound masking?
Most sounds can mask speech if it is loud enough. Elevators, HVAC systems, background music all create a white noise in the office space. Sound masking systems also can be purchased and installed in the ceilings of offices.
What is the Difference between HVAC and AHU?
What is difference between hvac and ahu
What is the difference between hvdc and HVAC?
HVDC is a programmer for heating and air. The HVAC is the installer for heating and air. I have a license for both of them,
What is the difference between 2 and 4 pipe hvac systems?
2 Pipes
What is the difference between local 638A and 638B?
638a are the steamfitters and 638b are the hvac technicians.
What is the difference between ac and hvac of hvac?
HVAC stands for Heating Ventilation and Air Conditioning. There realy is no difference, though some might think that "air conditioning" refers to the cooling component, but I like my air conditioned to be warm and clean in the winter too.
What is the difference between a furnace and a boiler?
A furnace heats air; a boiler heats water. --The HVAC Veteran
What is the difference between HVAC and refrigeration?
'HVAC' is Heating, Ventilation and Air Conditioning, i.e. linked basic mechanical building services. Refrigeration is a process which is just a part of one of those.
What is the difference between SMACNA and DW144?
Both methods are using in HVAC Ducting work mostly about 99% that smacna is using in that same.
What is the difference between a janitor and a custodian?
a maintenance worker usually requires more training such as electrician, plumbing or HVAC
What is CFM in HVAC system?
Short for cubic feet per minute, a measurement of the velocity at which air flows into or out of a space.
What is cfm in HVAC?
Short for cubic feet per minute, a measurement of the velocity at which air flows into or out of a space.
What is the difference between an AC and HVAC?
AC (Air Conditioning) is made for cooling and heating, ventilation that kills microorganisms. HVAC (Heating, Ventilation, Air Conditioning) The V stands for Ventilation and means that it takes air from the outside in to the inside. And AC dosent do that. I can't give any better anwer on that, maybe someone else.
